insisting that we're in no danger. rhodesiradiation when te dentist x-rays your mouth, you get one 100th of a unit. mammogram, four times as much. all in all, americans are exposed to six units per year, with cosmic rays, and radon in the atmosphere. the minimum oroszko i 10 per 1 million the minimum exposure could be 100. spleen damage, lymph nodes, and bone damage are the side effects. 3000 units you may not recover. above that, the dose is usually fatal.